Pliers



(No Model.)

' J. T. TH.

No. 582,001. Patented May 4, 1897 129 PATENT rrrcn.

JOHN T. SMITH, OF ROCK FALL, CONNECTICUT.

PLIERS.

SPECIFICATION forming part of Letters Patent No. 582,001, dated May 4,1897. Application filed August 3, 1898. Renewed April 2, 1897. SerialNo. 630,461. (No model.)

To all whom it ntay concern.-

Be it known that I, JOHN T. SMITH, of Rock Fall, in the county ofMiddlesex and State of Connecticut, have invented a new Improvement inPliers; and I do hereby declare the following, when taken in connectionwith the accompanying drawings and the letters of reference markedthereon, to be a full, clear, and exact description of the same, andwhich said drawings constitute part of this specification, andrepresent, in

Figure 1, a plan view of one form which a tool constructed in accordancewith myinvention may assume; Fig. 2, a view thereof in side elevation;Fig. 3, a broken sectional View of the jaws and yoke; Fig. 4, a detachedplan View of the yoke.

My invention relates to an improvement in pliers, the object being toproduce a simple and convenient tool composed of few parts andconstructed with particular reference to securing great power in theoperation of the jaws, whereby the pliers become particularly welladapted for closing car-seals, in splicing telegraph and telephonewires, and for use in other kindred situations where great power isrequired.

With these ends in view my invention consists in pliers having certaindetails of construction and combinations of parts, as will behereinafter described, and pointed out in the claims.

In carrying out my invention as herein shown I employ an oblongrectangular yoke A, which on account of its function in thetool Ishallhereinafter speak of as the fulcrumyoke. This yoke passes over andembraces the outer ends of the jaws B B of the tool, the outer edge ofeach jaw being formed with two transverse notches Z) Z) for thereception of the blade-like inner edges A A of the ends of the yoke. IVhen the said edges A A are engaged with the notches b I), the leverageavailable for the operation of the jaws B B is greater than when thesaid jaws are engaged with the notches Z) Z), the yoke being shiftedfrom the outer to the inner notches, and vice versa,according to theconditions under which the tool is used. For holding the yoke in place Iemployaspiral spring C, arranged in line with the yoke between the jawsand at its ends entered into sockets A A formed in the inner facesthereof, the spring being prevented from buckling and getting out ofplace by means of a short rod C passing through it and also entering thesaid sockets. It will be understood that the jaws project suificientlybeyond the yoke to permit them to do their work, whether the same be theclosing of a car-seal, the splicing of an electric wire, or otherwise.The inner ends of the jaws are secured by pivots D D to the outer endsof the handle-levers E E, the outer end of each of which is formed withan inwardly-projecting leverarm E, which are connected together by meansof a pivot D, located in the central plane of the tool, the arms E Ebeing constructed at their pivoted ends to forms an ordinaryknuckle-joint. A stop-pin F, extending inwardly from one of thehandle-levers E, engages with the other lever to limit their closingaction.

It will be readily understood that under the above-describedconstruction the jaws will be forced together with enormous power,resulting from the multiplying leverage obtained from the fulcrum-yokeand the leverarms of the handle-levers.

It is of course apparent that if desired the jaws may be cutting-jawsinstead of gripping or pressure jaws, the particular shape of the jawsbeing dependent upon the use to which the tool is to be put. I wouldtherefore have it understood that I do not limit my invention to theparticular construction herein shown and described, but hold myself atliberty to make such changes and alterations as fairly fall within thespirit and scope of my invention.

I-Iaving fully described my invention, what I claim as new, and desireto secure by Letters Patent, is-

1. The combination with two handle-levers having inwardly-extendinglever-arms which are pivoted together, of two jaws pivotally attached tothe outer ends of the handle-levers, and a fulcrum-yoke applied to theouter ends of the jaws which it embraces.

2. The combination with two handle-levers having inwardly-extendinglever-arms which are pivoted together, of two jaws pivotally attached tothe outer ends of the said handlelevers, a fulcrum-yoke embracing andconnecting the outer ends of the jaws, and a vers and having transversecoupling-notches formed in their outer edges, and a fulcrumyokeembracing the outer ends of the jaws, and having its ends adapted toenter the said notches through which it is adjustable upon the jaws.

In testimony whereof I have signed this specification in the presence oftwo subscribing Witnesses.

JOHN 'IUSMITH.

Witnesses:

E. II. IIA'rHAwAv, HARRIS WARNER.

